I'm not sure what the backend code for DTVUSA looks like, but I know on RabbitEars in PHP, code to do that would be something like this:
if ($user->doesnt_want_bar == 1) continue;
else { //bar goes here! }
Then just put an option on my user account page to modify the "doesnt_want_bar" field in the database, defaulting to a value of 0 when a user signs up.
Not sure if that helps you at all.
- Trip